Matter



UNITED STATES PATENT OFFICE.

EDUARD ULLRIOH, or HoeHs'r-oN-THE-MAm, nssietuoa TO CARL ROTH, orBERLIN, AND THE FARBWERKE, VORMALS MEISTER, LUGIUS & BR 'F'INING, ornooHsr-oNmHE-MAIN, GERMANY.

TRIMETHYLETHYLTHlONlN-BLUE' COLORING-MATTER.

SPECIFICATION forming part of Letters Patent No. 362,592, dated May 10,1887.

Application filed January 27, 1887. Serial No. 225,695. (No specimens.)Patented in France December 24, 1885, No. 173,137; in Germany December:25, i885, No. 38,573, and in England January I, 1886, No. 43.

To all whom it may concern.-

-Be it known that I, EDUARD ULLRIOH, doctor of philosophy, acitizen ofthe Empire of Germany, residing at Hochst-on-the-Main, in

theEmpire of Germany, haveinvented certain new and useful Improvementsin Trimethylethylthionin Blue; and I do hereby declare the. following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the. art to which it appertains to make and usethe same.

This invention. relates to a blue coloringmatter or dye-stuff, which Iterm trimethylethylthionin blue, the hydrochlorate oftrimethylethylthionin,

s s N (CH3): N S

being an essential constituent of the same.

This blue coloring-matter I produce by joint oxidation ofparamidodimethyl-auiline,

T 0 H, S g andethylmethyl-anilinein 2 presence of a hyposulphite, andprecipitating the coloring-matter from its solution by means ofchlorzinc and common salt. According to the said invention twelve partsof dimethylaniline are dissolved in diluted hy- 0 drochloric acid,(forty parts of water and sixty-five parts of hydrochloric acid,) andthen by seven parts of nitrite of sodium and subsequent addition of zincconverted into aniidodimethylaniline. Zinc is now added in 3 5 thequantity necessary to use up all of the free hydrochloric acid. Thesolution thus obtained is diluted with water to about five hundredbronze'like appearance.

parts, and then are added seventeen parts of hydrochlorate ofethylmethyl-aniline and twenty-five parts of hyposulphite of sodium. 0

.Now, I oxidize by adding a solution oft-went five parts of potassiumdichromate 01 for about two hours, add the quantity of sulphuric acidnecessary to bind the chromoxide and the alkalies, and expel thesulphurous acid by further boiling. Then the dissolved leuco compound isconverted into the coloring-matter by the addition of an oxidizingagent, and finally it is precipitated by means of common salt.

The coloringmatter is a brown powder of The blue solution of the same iseasily reduced into a colorless liquid, the original shade of which isrestored by oxidizing agents. By means of tannin and emetic tartar thecoloring-matter is fixed on the fiber so that it will resist washing.Quicksilver chloride and potassium bichromate precipitate the solution.The precipitate is of dark-blue shade. .60

What I claim as new, and desire to secure by Letters Patent, is

As a new product, trimethylethylthionin-' blue produced by jointoxidation of paramidodimethylaniline and ethylmethyl-aniline in presenceof a hyposulphite, and having the characteristics above set forth.

In testimony whereof I afiix my signature in presence of two witnesses.v

EDUARD ULLRIGH.

Witnesses:

ALVES'IO S. HoGUE, JEAN GRUND.

